Photosensitive paste composition, barrier rib prepared using the composition and plasma display panel comprising the barrier rib

Abstract

Photosensitive paste compositions, barrier ribs of plasma display panels (PDPs) including the same, and PDPs including the barrier ribs are provided. More particularly, a photosensitive paste composition includes an organic component and an inorganic component, where the organic component and the inorganic component each have an average refractive index of less than 1.5. The organic component used in the photosensitive paste composition is not harmful to the human body, is inexpensive, is generally easily obtained, and succumbs readily to thermal decomposition. Accordingly, using such an organic component, barrier ribs of PDPs having high resolution and high compactness by exposure to light only once can be prepared.

1. A photosensitive paste composition comprising:
 an organic component comprising a binder, a cross-linking agent and a photo initiator, the organic component having an average refractive index of less than 1.5; and 
 an inorganic component comprising a low melting point glass frit and a high melting point glass fit, the low melting point glass frit having an average refractive index of less than 1.52 and comprising a complex oxide comprising at least three oxides of an element selected from the group consisting of Si, B, Al, Ba, Zn, Mg, Ca, P, V, Mo, Te, and combinations thereof, and the high melting point glass frit having an average refractive index of less than 1.5 such that the inorganic component has an average refractive index of less than 1.5. 
 
     
     
       2. The photosensitive paste composition of  claim 1 , wherein the organic component is present in an amount ranging from about 20 to about 70 parts by volume with respect to 100 parts by volume of the photosensitive paste composition. 
     
     
       3. The photosensitive paste composition of  claim 1 , wherein each of the binder and the cross-linking agent comprises an aliphatic group and does not comprise an aromatic group, each of the binder and cross-linking agent has a refractive index of less than 1.5. 
     
     
       4. The photosensitive paste composition of  claim 1 , wherein the binder is an acryl-based resin comprising a carboxyl group. 
     
     
       5. The photosensitive paste composition of  claim 4 , wherein the acryl-based resin comprising a carboxyl group is a copolymer of a monomer comprising a carboxyl group and a monomer comprising an ethylenically unsaturated group,
 wherein the monomer comprising a carboxyl group is selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic acid, vinylacetic acids, anhydrides thereof, and combinations thereof, and 
 wherein the monomer comprising an ethylenically unsaturated group is selected from the group consisting of methyl(meth)acrylate, ethyl(meth)acrylate, n-propyl(meth)acrylate, isopropyl(meth)acrylate, n-butyl(meth)acrylate, sec-butyl(meth)acrylate, isobutyl(meth)acrylate, tert-butyl(meth)acrylate, n-pentyl(meth)acrylate, allyl(meth)acrylate, butoxyethyl(meth)acrylate, butoxytriethyleneglycol(meth)acrylate, cyclohexyl(meth)acrylate, dicyclopentanyl(meth)acrylate, dicyclopentenyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, glycerol(meth)acrylate, glycidyl(meth)acrylate, isobornyl(meth)acrylate, isodecyl(meth)acrylate, isooctyl(meth)acrylate, lauryl(meth)acrylate, 2-methoxyethyl(meth)acrylate, methoxyethyleneglycol(meth)acrylate, methoxydiethyleneglycol(meth)acrylate, stearyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, aminoethyl(meth)acrylate, and combinations thereof. 
 
     
     
       6. The photosensitive paste composition of  claim 5 , wherein the binder has a cross-linkable group comprising a reaction product of the carboxylic group of the copolymer and an ethylenically unsaturated compound,
 wherein the ethylenically unsaturated compound is selected from the group consisting of acryloylchloride, methacryloylchloride, allyl chloride, glycidylacrylate, glycidylmethacrylate, 3,4-epoxycyclohexylmethylacrylate, and 3,4-epoxycyclohexylmethylmethacrylate. 
 
     
     
       7. The photosensitive paste composition of  claim 1 , wherein the binder further comprises a material selected from the group consisting of cellulose, methylcellulose, ethylcellulose, n-propyl cellulose, hydroxyethyl cellulose, 2-hydroxyethylcellulose, methyl-2-hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxybutylmethylcellulose, hydroxypropylmethylcellulose phthalate, cellulose nitrate, cellulose acetate, cellulose triacetate, cellulose acetate butyrate, cellulose acetate propionate, (acrylamidomethyl)cellulose propionate, (acrylamidomethyl)cellulose acetate propionate, cellulose acetate butyrate, cyanoethylated cellulose, pectic acid, chitosan, chitin, carboxymethylcellulose, carboxymethylcellulose sodium salt, carboxyethylcellulose, carboxyethylmethylcellulose, and combinations thereof. 
     
     
       8. The photosensitive paste composition of  claim 5 , wherein the copolymer has a weight average molecular weight ranging from about 5,000 to about 50,000 g/mol, and an acid value ranging from about 50 to about 250 mgKOH/g. 
     
     
       9. The photosensitive paste composition of  claim 1 , wherein the binder is present in the organic component in an amount ranging from about 30 to about 80 parts by weight with respect to 100 parts by weight of the organic component. 
     
     
       10. The photosensitive paste composition of  claim 1 , wherein the cross-linking agent is selected from the group consisting of mono(meth)acrylate, multi-functional (meth)acrylates, combinations thereof,
 wherein the mono(meth)acrylate is selected from the group consisting of (meth)acrylic acid, methyl(meth)acrylate, ethyl(meth)acrylate, n-propyl(meth)acrylate, isopropyl(meth)acrylate, n-butyl(meth)acrylate, sec-butyl(meth)acrylate, isobutyl(meth)acrylate, tert-butyl(meth)acrylate, n-pentyl(meth)acrylate, allyl(meth)acrylate, butoxyethyl(meth)acrylate, butoxytriethyleneglycol(meth)acrylate, cyclohexyl(meth)acrylate, dicyclopentanyl(meth)acrylate, dicyclopentenyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, glycerol(meth)acrylate, glycidyl(meth)acrylate, isobornyl(meth)acrylate, isodecyl(meth)acrylate, isooctyl(meth)acrylate, lauryl(meth)acrylate, 2-methoxyethyl(meth)acrylate, methoxyethyleneglycol(meth)acrylate, methoxydiethyleneglycol(meth)acrylate, stearyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, aminoethyl(meth)acrylate, and combinations thereof, and 
 wherein the multi-functional (meth)acrylate is selected from the group consisting of:
 di(meth)acrylates selected from the group consisting of 1,6-hexanediol di(meth)acrylate, (ethoxylated) 1,6-hexanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 2-butyl-2-ethyl-1,3-propanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, tripropyleneglycol di(meth)acrylate, dipropyleneglycol di(meth)acrylate, tetraethyleneglycol di(meth)acrylate, and combinations thereof; 
 tri(meth)acrylates selected from the group consisting of trimethylolpropane tri(meth)acrylate, (ethoxylated) trimethylolpropane tri(meth)acrylate, (propoxylated) glycerin tri(meth)acrylate, pentaerithritol tri(meth)acrylate, (propoxylated) trimethylolpropane-3-tri(meth)acrylate, and combinations thereof; 
 tetra(meth)acrylates selected from the group consisting of ditrimethylolpropane tetra(meth)acrylate, tetramethylolpropane tetra(meth)acrylate, pentaerithritol tetra(meth)acrylate, and combinations thereof; 
 penta(meth)acrylates; 
 dipentaerithritol hexa(meth)acrylate; and 
 mixtures thereof. 
 
 
     
     
       11. The photosensitive paste composition of  claim 1 , wherein the cross-linking agent is present in the organic component in an amount ranging from about 15 to about 60 parts by weight with respect to 100 parts by weight of the organic component. 
     
     
       12. The photosensitive paste composition of  claim 1 , wherein the photo initiator is selected from the group consisting of benzophenone, o-benzoyl benzoic acid methyl ester, 4,4-bis(dimethylamine)benzophenone, 4,4-bis(diethylamino)benzophenone, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenyl-2-phenylacetophenone, 2-methyl-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphineoxide, bis(2,4,6-trimethylbenzoyl)phenylphosphineoxide, and combinations thereof. 
     
     
       13. The photosensitive paste composition of  claim 1 , wherein the photo initiator is present in the organic component in an amount ranging from about 1 to about 20 parts by weight with respect to 100 parts by weight of the organic component. 
     
     
       14. The photosensitive paste composition of  claim 1 , wherein the organic component further comprises an additive selected from the group consisting of sensitizers, polymerization inhibitors, antioxidants, ultraviolet absorbents, antifoaming agents, dispersants, leveling agents, plasticizers, thixotropic agents, and combinations thereof. 
     
     
       15. The photosensitive paste composition of  claim 1 , wherein the organic component comprises a solvent having a boiling point of at least about 150° C. 
     
     
       16. The photosensitive paste composition of  claim 15 , wherein the solvent is selected from the group consisting of ethyl carbitol, butyl carbitol, ethyl carbitol acetate, butyl carbitol acetate, texanol, terpine oil, diethylene glycol, dipropylene glycol, tripropylene glycol, dipropyleneglycol methylether, dipropyleneglycol ethylether, dipropyleneglycol monomethylether acetate, γ-butyrolactone, cellosolve acetate, butyl cellosolve acetate, and combinations thereof. 
     
     
       17. The photosensitive paste composition of  claim 1 , wherein the inorganic component is present in an amount ranging from about 30 to about 80 parts by volume with respect to 100 parts by volume of the photosensitive paste compound. 
     
     
       18. The photosensitive paste composition of  claim 1 , wherein the low melting point glass frit is selected from the group consisting of SiO 2 —B 2 O 3 —Al 2 O 3  based glasses, SiO 2 —B 2 O 3 —BaO based glasses, SiO 2 —B 2 O 3 —CaO based glasses, ZnO—B 2 O 3 —Al 2 O 3  based glasses, ZnO—SiO 2 —B 2 O 3  based glasses, P 2 O 5  based glasses, SnO—P 2 O 5  based glasses, V 2 O 5 —P 2 O 5  based glasses, V 2 O 5 —Mo 2 O 3  based glasses, V 2 O 5 —P 2 O 5 —TeO 2  based glasses, SiO 2 —B 2 O 3 —Al 2 O 3 —F based glasses, SiO 2 —B 2 O 3 —BaO—F based glasses, SiO 2 —B 2 O 3 —CaO—F based glasses, ZnO—B 2 O 3 —Al 2 O 3 —F based glasses, ZnO—SiO 2 —B 2 O 3 —F based glasses, P 2 O 5 —F based glasses, SnO—P 2 O 5 —F based glasses, V 2 O 5 —P 2 O 5 —F based glasses, V 2 O 5 —Mo 2 O 3 —F based glasses, V 2 O 5 —P 2 O 5 —TeO 2 —F based glasses, and combinations thereof. 
     
     
       19. The photosensitive paste composition of  claim 1 , wherein a particle diameter of the low melting point glass frit has a median value (D 50 ) ranging from about 2 to about 5 μm, a minimum value (D min ) of about 0.1 μm or greater, and a maximum value (D max ) of about 20 μm or smaller. 
     
     
       20. The photosensitive paste composition of  claim 1 , wherein the low melting point glass frit is present in an amount ranging from about 60 to about 95 parts by volume with respect to 100 parts by volume of the inorganic component. 
     
     
       21. A photosensitive paste composition comprising:
 an organic component comprising a binder, a cross-linking agent and a photo initiator, the organic component having an average refractive index of less than 1.5; and 
 an inorganic component comprising a low melting point glass frit and a high melting point glass frit, the low melting point glass frit having an average refractive index of less than 1.52 and the high melting point glass frit having an average refractive index of less than 1.5 and comprising a complex oxide comprising at least two oxides of elements selected from the group consisting of Si, B, Al, Ba, Zn, Mg, Ca, and combinations thereof, such that the inorganic component has an average refractive index of less than 1.5. 
 
     
     
       22. The photosensitive paste composition of  claim 21 , wherein the high melting point glass frit is selected from the group consisting of SiO 2 —B 2 O 3  based glasses, SiO 2 —B 2 O 3 —Al 2 O 3  based glasses, SiO 2 —B 2 O 3 —BaO based glasses, SiO 2 —B 2 O 3 —CaO based glasses, SiO 2 —B 2 O 3 —MgO based glasses, SiO 2 —Al 2 O 3 —BaO based glasses, SiO 2 —Al 2 O 3 —CaO based glasses, SiO 2 —Al 2 O 3 —MgO based glasses, and combinations thereof. 
     
     
       23. The photosensitive paste composition of  claim 1 , wherein a particle diameter of the high melting point glass frit has a median value (D 50 ) ranging from about 1 to about 4 μm, a minimum value (D min ) of about 0.1 μm or greater, and a maximum value (D max ) of about 20 μm or smaller. 
     
     
       24. The photosensitive paste composition of  claim 1 , wherein the high melting point glass frit is present in an amount ranging from about 5 to about 40 parts by volume with respect to 100 parts by volume of the inorganic component. 
     
     
       25. A barrier rib of a plasma display panel comprising a photosensitive paste composition according to  claim 1 . 
     
     
       26. A plasma display panel comprising a barrier rib according to  claim 25 .